Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['f', 'z', '511', 'y', '9693', 'm', 'C']

6, 26, 511, 25, 9693, 13, 3